TwinTurbo.NET: Nissan 300ZX forum - There is a specific charging system test that can be done
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Subject There is a specific charging system test that can be done
     
Posted by ttsmokin on September 16, 2014 at 1:19 PM
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In Reply To no underdrive crank pulley posted by Z32CheekiBreeki on September 15, 2014 at 11:04 PM
     
Message You would need to take it to a shop who has the machine. When you load up the alternator heavily it is normal for the bearing noise to increase slightly.

As far as checking belt tension, there are a few methods. You can buy a belt deflection gauge which will tell you with great accuracy. Or you can shoot for 1/4" deflection on the alternator belt, the FSM shows you where the deflection should occur. Some like the method of twisting the belt, it should not twist past 90*.

Also an alternator rebuild shop should be able to bench test your alternator if you have it removed.

     
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